Getting Started with the Owl Robot

// defines pins numbers
const int trigPin = 11;
const int echoPin = 12;

// defines variables
long duration;
int distance;

void setup() {
  pinMode(trigPin, OUTPUT); // Make the trigPin an OUTPUT
  pinMode(echoPin, INPUT); // Make the echoPin an INPUT
  Serial.begin(9600); // Setup the Serial Port
}

void loop() {

  // Clear the trigPin
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);

  // Send a pulse by setting the trigPin Higj for 10 Micro seconds
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Read the length of time for the sound wave to return
  duration = pulseIn(echoPin, HIGH);

  // Calculating the total distance from the object
  distance = duration * 0.034 / 2;

  // Prints the distance to the Serial Port
  Serial.print("The Distance Is: ");
  Serial.println(distance);
}

int trigPin = 11;      // trig pin of HC-SR04
int echoPin =12;     // Echo pin of HC-SR04

int revleft4 = 7;       //Reverse motion of Left motor
int fwdleft5 = 9;       //Forward motion of Left motor
int revright6 = 8;      //Reverse motion of Right motor
int fwdright7 = 4;      //Forward motion of Right motor

long duration, distance;

void setup() {
  
  delay(random(500,2000));   // delay for random time
  Serial.begin(9600);
  pinMode(revleft4, OUTPUT);      // set Motor pins as output
  pinMode(fwdleft5, OUTPUT);
  pinMode(revright6, OUTPUT);
  pinMode(fwdright7, OUTPUT);
  
  pinMode(trigPin, OUTPUT);         // set trig pin as output
  pinMode(echoPin, INPUT);          //set echo pin as input to capture reflected waves
}

void loop() {

  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);   
  digitalWrite(trigPin, HIGH);     // send waves for 10 us
  delayMicroseconds(10);
  duration = pulseIn(echoPin, HIGH); // receive reflected waves
  distance = duration / 58.2;   // convert to distance
  delay(10);
    // If you dont get proper movements of your robot then alter the pin numbers
  if (distance > 19)            
  {
    digitalWrite(fwdright7, HIGH);                    // move forward
    digitalWrite(revright6, LOW);
    digitalWrite(fwdleft5, HIGH);                                
    digitalWrite(revleft4, LOW);                                                       
  }

  if (distance < 18)
  {
    digitalWrite(fwdright7, LOW);  //Stop                
    digitalWrite(revright6, LOW);
    digitalWrite(fwdleft5, LOW);                                
    digitalWrite(revleft4, LOW);
    delay(500);
    digitalWrite(fwdright7, LOW);      //movebackword         
    digitalWrite(revright6, HIGH);
    digitalWrite(fwdleft5, LOW);                                
    digitalWrite(revleft4, HIGH);
    delay(500);
    digitalWrite(fwdright7, LOW);  //Stop                
    digitalWrite(revright6, LOW);
    digitalWrite(fwdleft5, LOW);                                
    digitalWrite(revleft4, LOW);  
    delay(100);  
    digitalWrite(fwdright7, HIGH);       
    digitalWrite(revright6, LOW);   
    digitalWrite(revleft4, LOW);                                 
    digitalWrite(fwdleft5, LOW);  
    delay(500);
  }

}